47 lines
793 B
ArmAsm
47 lines
793 B
ArmAsm
.define .aar2
|
|
.sect .text
|
|
.sect .rom
|
|
.sect .data
|
|
.sect .bss
|
|
.sect .text
|
|
|
|
! Load address of array element, decriptor contains 2-bytes integers
|
|
! Expects on stack: pointer to array descriptor
|
|
! index
|
|
! base address
|
|
! Yields on stack: address of array element
|
|
|
|
.aar2:
|
|
pop h
|
|
shld .retadr1
|
|
mov h,b
|
|
mov l,c
|
|
shld .bcreg
|
|
|
|
pop h ! hl = pointer to descriptor
|
|
pop d ! de = index
|
|
mov a,e ! bc = index - lower bound
|
|
sub m
|
|
inx h
|
|
mov c,a
|
|
mov a,d
|
|
sbb m
|
|
inx h
|
|
mov b,a
|
|
push b ! first operand to multiply
|
|
inx h
|
|
inx h
|
|
mov c,m ! bc = size
|
|
inx h
|
|
mov b,m
|
|
push b ! second operand to multiply
|
|
call .mli2 ! de = size * (index - lower bound)
|
|
pop h ! hl = base address
|
|
dad d ! hl = address of array[index]
|
|
push h
|
|
|
|
lhld .bcreg
|
|
mov b,h
|
|
mov c,l
|
|
lhld .retadr1
|
|
pchl
|